Fit For 987 997 99710603702 One Intercooler Tank. By significantly lowering the temperature of air compressed by the turbocharger, the intercooler increases its density, allowing more oxygen to enter the cylinders for combustion. The presence of an intercooler effectively prevents engine knocking or detonation, which safeguards critical internal components from potential damage under high boost. Water-cooled configurations provide consistent cooling effectiveness that doesn't rely on vehicle speed, ideal for regular travel within urban environments. Air-cooled systems have a simple structural layout and straightforward maintenance, appropriate for driving scenarios that often include high-speed operation., Manufacturer: XKBUAPM